Timeline chart - Grouping of bar labels within a row label.

[Al Perantoni]

Hi,

I was wondering if it's possible to group bar label elements within a timeline chart together?
Please see the following chart example:

https://jsfiddle.net/6owsrck3/

In the above example, I'd like to see the data grouped by the row label (already done) and then grouped by the bar label.
See following before image and after images.